If it's failing to turn on, the main power supply is probably at
fault and without some technical background and a couple of test instruments,
you will not be able to do the repair yourself.
What you can do though is; unplug the set, let it
stand overnight or at least several hours, remove the back panel and look for a
separate board with mostly larger components on it; it will have a ferrite core
(no laminations as with a line-frequency part) transformer on it and several
larger capacitors which are cylindrical and mounted vertically to the board.
Before touching anything inside, especially on
that board, allow several hours to be safe since the larger capacitors can hold
a painful voltage charge for some hours.
If you see signs of overheating such as
discoloration of the board material, the PSU may not be repairable but if you
can find a part number on the board, you might be able to buy the power supply
from the mfr. and install it yourself but it will likely have the same problem
eventually unless they have altered the design or improved component quality.
If there are no signs of heat damage to the board,
there may be companies offering to repair it as a subassembly instead of
repairing the whole set which could be much more expensive.
If you choose to replace or have it done, the main
power supply still may not be at fault since most are capable
of switching on and off if a downstream problem is causing an overload and the
power supply for the backlight may be at fault.
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